Two totally different cars designed for 2 different type of motor sports.
GTR = Circuit
EVO = Rally
Both have different characteristics.
Best to test drive both and see what you think.
I have only driven an EVO 6.5 TME and was a fun car.
GTR has more pulling power at the top end due it being a 2.6lt inline 6 twin turbo vs 2lt inline 4 turbo.
All depends on what you like, as both cars are good in their own respects and modifications can be endless for both, depending on how big your wallet is...